From 7bb0cff9325cc5c1214310626b4c0cd47a1071fa Mon Sep 17 00:00:00 2001
From: Ibuki Omatsu <isan.ethen@gmail.com>
Date: Wed, 25 Jun 2025 14:48:33 +0000
Subject: [PATCH] feat: Add get_proc_credentials functions.

---
 Cargo.toml |  2 +-
 src/lib.rs | 18 +++++++++++++-----
 2 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/Cargo.toml b/Cargo.toml
index b3aeb46f6a..0b2edf7db4 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "libredox"
 authors = ["4lDO2 <4lDO2@protonmail.com>"]
-version = "0.1.3"
+version = "0.1.4"
 edition = "2021"
 license = "MIT"
 description = "Redox stable ABI"
diff --git a/src/lib.rs b/src/lib.rs
index 93692fc88a..2a1794002f 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -181,11 +181,11 @@ pub mod errno {
     };
 }
 pub mod data {
+    pub use libc::iovec as IoVec;
     pub use libc::sigaction as SigAction;
     pub use libc::stat as Stat;
     pub use libc::statvfs as StatVfs;
     pub use libc::timespec as TimeSpec;
-    pub use libc::iovec as IoVec;
 
     // TODO: Remove
     pub fn timespec_from_mut_bytes(bytes: &mut [u8]) -> &mut TimeSpec {
@@ -247,6 +247,10 @@ extern "C" {
     fn redox_get_ruid_v1() -> RawResult;
     fn redox_get_egid_v1() -> RawResult;
     fn redox_get_rgid_v1() -> RawResult;
+
+    // This function is used to get the credentials, pid, euid, egid etc. of the process with the target pid.
+    fn redox_get_proc_credentials_v0(target_pid: usize, buf: &mut [u8]) -> RawResult;
+
     fn redox_setrens_v1(rns: usize, ens: usize) -> RawResult;
     fn redox_mkns_v1(names: *const data::IoVec, num_names: usize, _flags: u32) -> RawResult;
 
@@ -376,7 +380,6 @@ pub mod call {
         Ok(Error::demux(unsafe {
             redox_openat_v1(fd, path.as_ptr(), path.len(), flags as u32)
         })?)
-
     }
     #[inline]
     pub fn dup(fd: usize, buf: impl AsRef<[u8]>) -> Result<usize> {
@@ -473,6 +476,13 @@ pub mod call {
     pub fn getpid() -> Result<usize> {
         Error::demux(unsafe { redox_get_pid_v1() })
     }
+
+    #[inline]
+    // [u8; size_of::<crate::protocol::ProcMeta>()]
+    pub fn get_proc_credentials(target_pid: usize, buf: &mut [u8]) -> Result<usize> {
+        Error::demux(unsafe { redox_get_proc_credentials_v0(target_pid, buf) })
+    }
+
     #[inline]
     pub fn setrens(rns: usize, ens: usize) -> Result<usize> {
         Error::demux(unsafe { redox_setrens_v1(rns, ens) })
@@ -573,8 +583,6 @@ pub mod call {
         // no-op
         let iovecs = ioslice::IoSlice::cast_to_raw_iovecs(names);
 
-        unsafe {
-            Error::demux(redox_mkns_v1(iovecs.as_ptr(), iovecs.len(), 0))
-        }
+        unsafe { Error::demux(redox_mkns_v1(iovecs.as_ptr(), iovecs.len(), 0)) }
     }
 }